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I'm trying to build a new trigger (timer and/or motion detector) for my small fog machine (110vac). It initially had a wireless trigger device which plugged into a 3-conductor connector at the rear of the machine. The device has failed.

I've been looking at the schematic for a while, and I do not get the logic of it. I understand that the thermostat (TSTAT) cycles on and off to keep the heater at the correct temperature, and the pump will only operate when the heater is off (TSTAT is open). Below is a quick wiring diagram I created. Can anyone explain to me the logic of how this circuit works? Once I figure it out, I will post my new trigger solution.

fog machine wiring diag.png

With thanks.
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